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Luminous flux
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In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation, in that lumino
Diagram of luminous flux emitted within a certain solid angle.
Diagram of luminous flux emitted within a certain solid angle.
Integrating sphere used for measuring the luminous flux of a light source
Integrating sphere used for measuring the luminous flux of a light source
Candela
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Candela is the SI unit of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common wax candle has a luminous intensity of roughly 1 cd.
Luminous flux
…of light. The SI unit of luminous flux is the lumen (lm). One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian. 1 lm = 1 cd × 1 sr…
1=radiating tube of thorium dioxide; 2=melting pot; 3=solidifying platinum
1=radiating tube of thorium dioxide; 2=melting pot; 3=solidifying platinum